JP2016068509A - Vulcanization molding device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a vulcanization molding device capable of detecting the falling-off of a valve member fitted to a vent hole bored in a tire molding surface of a tire molding die immediately after the occurrence of the falling off.SOLUTION: A vulcanization molding device 1 comprises a tire molding die 10 where a vent hole 18 is bored in a tire molding surface 10a; a valve member 54 that is fitted to the vent hole 18 to open and close the vent hole 18; and heaters 32, 35 that heat the tire molding die 10. The vulcanization molding device 1 includes: non-contact type temperature sensors 40a, 40b, 40c, 40d that measure the temperature distribution in the tire molding surface 10a of the heated tire molding die 10; and a detection part 60 that detects the falling-off of the valve member 54 fitted to the vent hole 18 from the temperature distribution obtained by the temperature sensors 40a, 40b, 40c, 40d.SELECTED DRAWING: Figure 3

Description

  The present invention relates to a vulcanization molding apparatus.

  The vulcanization molding apparatus includes a tire molding die that molds an unvulcanized tire and a vulcanizer (heating device) that heats the tire molding die. The tire molding die is provided with a plurality of vent holes on the tire molding surface for molding the outer surface of the tire.

In such a vulcanization molding apparatus, during vulcanization molding, air between the unvulcanized tire and the tire molding surface is discharged through the vent hole, thereby preventing the occurrence of air accumulation called a bear. However, due to the rubber flowing into the vent hole, many rubber protrusions called spews may be formed on the outer surface of the vulcanized tire. Therefore, in the vent hole, in order to prevent spew formation, a mechanism for preventing the inflow of rubber into the vent hole using an exhaust plug is known (for example, see Patent Documents 1 and 2 below).
The exhaust plug urges the valve member attached in the cylindrical housing toward the tire molding surface with a spring, opening the vent hole and exhausting the air to the outside at the initial stage of vulcanization molding. After the tire comes into contact with the tire molding surface, the contact pressure is pressed against the urging force of the spring to close the vent hole, thereby preventing spewing.

However, in such an exhaust plug, since the tip of the valve member protrudes into the tire molding die at the initial stage of vulcanization molding, the unvulcanized rubber is formed between the tip of the valve member and the tire molding surface. When vulcanized while being sandwiched between the two, the valve member may be pulled out together with the tire and removed from the housing when the tire is removed, or in some cases, the valve member may be mixed into the vulcanized tire as a foreign object.
Since vulcanization molding equipment normally performs vulcanization molding of many unvulcanized tires continuously, it cannot be detected immediately after the valve member is dropped, and many tires with unintended spews are obtained. Or the tire mixed with the valve member may flow to the post-vulcanization molding process.

JP-A-9-141660 JP 2011-1116012 A

  The present invention has been made in consideration of such problems, and is a vulcanization molding apparatus in which a valve member for opening and closing the vent hole is provided in a vent hole formed in a tire molding surface of a tire molding die. An object of the present invention is to provide a vulcanization molding apparatus capable of detecting the valve member immediately after it is detached.

  A vulcanization molding apparatus according to the present invention includes a tire molding die having a vent hole formed in a tire molding surface, a valve member attached to the vent hole for opening and closing the vent hole, and heating the tire molding die. A non-contact type temperature sensor that measures a temperature distribution of the tire molding surface of the heated tire molding die, and a temperature distribution obtained by the temperature sensor. And a detection unit that detects the drop-off of the valve member attached to the vent hole.

  Further, another vulcanization molding apparatus according to the present invention includes a tire molding die having a vent hole formed in a tire molding surface, a valve member attached to the vent hole to open and close the vent hole, and the tire molding. In a vulcanization molding apparatus comprising a heating device for heating a mold, a non-contact type temperature sensor for measuring a temperature distribution of the tire molding surface of the heated tire molding mold, and the tire molding as a reference A storage unit that stores data relating to the temperature distribution of the surface as reference temperature distribution data; and the valve mounted in the vent hole by comparing the temperature distribution acquired by the temperature sensor with reference temperature distribution data stored in the storage unit And a detection unit that detects the dropping of the member.

  According to the present invention, it is possible to detect whether or not the valve member is dropped from the time when the vulcanized tire is taken out from the tire mold until the next unvulcanized tire is vulcanized and molded. Since this can be detected immediately after dropping off, a large number of tires with unintended spews can be obtained, and the tire mixed with the valve member can be prevented from flowing into the post-vulcanization molding process.

1 is a cross-sectional view of a vulcanization molding apparatus according to a first embodiment of the present invention. It is sectional drawing of a vent hole. It is sectional drawing in the mold opening state of the vulcanization molding apparatus concerning a 1st embodiment. It is a flowchart of the vulcanization molding apparatus concerning a 1st embodiment. It is sectional drawing in the mold opening state of the vulcanization molding apparatus concerning a 2nd embodiment.

(First embodiment)
Hereinafter, a first embodiment of the present invention will be described with reference to the drawings.

  The vulcanization molding apparatus 1 of this embodiment vulcanizes and molds an unvulcanized tire T set so that the tire axial direction is up and down by heating and pressurizing, as shown in FIGS. A tire molding die 10 for molding the tire T, a container 20 to which the tire molding die 10 is attached, a vulcanizer 30 for driving and heating the tire molding die 10 through the container 20, and a tire molding surface. The non-contact type temperature sensors 40a, 40b, 40c, and 40d that measure the temperature distribution of the gas and the vulcanization molding apparatus 1 and also function as a detection unit that detects the dropping of the stem 54 attached to the vent hole 18. And a control unit 60.

  The tire molding die 10 includes a sector 12 that abuts on a tread portion of the tire T, an upper die 14 and a lower die 15 that abut on a sidewall portion of the tire T, and a pair of upper and lower sides to which a bead portion of the tire T is fitted. And a bead ring 17.

  The sector 12, the upper die 14, the lower die 15, and the bead ring 17 constituting the tire molding die 10 are made of a heat-resistant metal material such as iron, and the tire molding surface 10a for molding the outer surface of the tire T includes: A convex portion for forming the groove portion and a concave portion for forming the land portion are provided, and a tread pattern corresponding to the concave and convex shape is formed on the tread surface by vulcanization molding of the tire T.

  Further, as shown in FIG. 2, the tire molding surface 10a is provided with a vent hole 18 for discharging air between the unvulcanized tire T and the tire molding surface 10a during vulcanization molding. An exhaust plug 50 is attached to the vent hole 18.

  The exhaust plug 50 includes a cylindrical housing 52 that is fitted into the vent hole 18, and a stem (valve member) 54 that is inserted into the hollow portion 52 a of the housing 52. The housing 52 and the stem 54 are made of a heat-resistant metal material such as stainless steel. The stem 54 is urged toward the tire molding surface 10 a by a spring 56, but is normally prevented from coming out by the action of the stopper 58. The stopper 58 can pass through the hollow portion 52 a of the housing by elastically deforming the stem 54 so as to close the slit 59.

  As shown in FIG. 2, the exhaust plug 50 having such a structure is configured such that the stem 54 is pressed by a spring 56 before the unvulcanized tire T disposed in the tire molding die 10 is pressed against the tire molding surface 10a. When the stopper 58 of the stem 54 is locked to the peripheral edge of the hollow portion 52a of the housing 52 in a state of being biased toward the inside of the tire molding die 10, the tire molding die is passed through the hollow portion 52a of the housing 52. The inside and outside of the mold 10 communicate with each other, and the exhaust plug 50 is opened. On the other hand, when the unvulcanized tire T arranged in the tire molding die 10 is pressed against the tire molding surface 10a, the stem 54 resists the urging force of the spring 56 by the unvulcanized rubber constituting the tire T. Thus, the exhaust plug 50 is closed by being pushed into the ventilation portion 11 and covering the hollow portion 52a of the housing 52 from the tire molding surface 10a side.

  The container 20 includes a segment 21 connected to the sector 12, a jacket ring 22 that moves the segment 21 in the tire radial direction, an upper container plate 23 that supports the upper mold 14 and the upper bead ring 17, a lower mold 15 and A lower container plate 24 that supports the lower bead ring 17 and is disposed below the segment 21 and slidably supports the segment 21.

  The segment 21 is provided for each divided sector 12, and the sector 12 is fixed to the inside in the tire radial direction by bolts. The segment 21 has an inclined surface 21a whose side opposite to the side on which the sector 12 is attached (that is, on the outer side in the tire radial direction) is inclined downward in the tire radial direction toward the lower side.

  The jacket ring 22 is an annular member provided on the radially outer side of the plurality of segments 21, and the inner peripheral surface thereof is inclined along the inclined surface 21 a of the segment 21, and is slidable on the inclined surface 21 a. It is attached with. The jacket ring 22 moves up and down relative to the segment 21 to move the segment 21 in the tire radial direction while sliding on the inclined surface 21 a of the segment 21.

  The upper container plate 23 has the upper mold 14 and the upper bead ring 17 fixed thereto, and supports the segment 21 slidably in the tire radial direction via an upper slide 26 on the outer side in the tire radial direction of the upper mold 14. The upper container plate 23 is attached to an upper platen 31 provided in the vulcanizer 30 and is heated by a heating device 32 provided in the upper platen 31, and is also lifted and lowered by an elevator means 33 connected to the upper platen 31. It moves up and down relatively with respect to the lower container plate 24.

  The lower container plate 24 has a lower mold 15 and a lower bead ring 17 fixed thereto, and a lower slide 27 that supports the bottom surface of the segment 21 so that the segment 21 is placed and is slidable in the tire radial direction. Yes. The lower container plate 24 is attached to a lower platen 34 provided in the vulcanizer 30 and is heated by a heating device 35 provided in the lower platen 34.

  The vulcanizer 30 includes an upper platen 31, a lower platen 34, a lifting / lowering means 33, and a heating / lowering means 36 for moving the jacket ring 22 up and down in addition to the heating devices 32 and 35, thereby the segment 21 and the jacket ring 22. Can be moved up and down separately.

  As shown in FIG. 3, the temperature sensors 40 a, 40 b, 40 c, and 40 d are in a state in which the sector 12 and the upper mold 14 are spaced upward from the lower mold 15 and the tire T does not exist inside the tire molding mold 10. This is a non-contact type temperature sensor that measures the temperature distribution of the tire molding surface 10a of the tire molding die 10. As the non-contact type temperature sensors 40a, 40b, 40c, and 40d, for example, a radiation temperature sensor that measures infrared radiation energy emitted from the tire molding surface 10a can be used.

  In the present embodiment, a rotating body 42 that rotates concentrically with the rotation axis of the tire T set in the tire molding die 10 is disposed between the upper mold 14 and the lower mold 15, and 3 above the rotating body 42. Two temperature sensors 40a, 40b, and 40c are disposed, and one temperature sensor 40d is disposed below the rotating body 42.

  Of the three temperature sensors 40a, 40b, and 40c provided on the upper side of the rotating body 42, the temperature sensor 40a is directed to the upper part of the tire molding surface 10a of the sector 12, and the temperature sensor 40b is the tire molding surface 10a of the sector 12. The temperature sensor 40c is directed to the lower portion and the tire molding surface 10a of the upper mold 14 is directed to the lower portion. Further, the temperature sensor 40 d provided on the lower side of the rotating body 42 is directed to the tire molding surface 10 a of the lower mold 15.

  Each temperature sensor 40 a, 40 b, 40 c, 40 d provided on the rotating body 42 measures the temperature of the tire molding surface 10 a while rotating around the rotation axis of the tire T by the rotation of the rotating body 42. Thereby, the temperature sensor 40a measures the temperature distribution of the whole circumferential direction above the tire molding surface 10a of the sector 12, and the temperature sensor 40b measures the temperature distribution of the whole circumferential direction of the tire molding surface 10a of the sector 12 below. The temperature sensor 40c measures the temperature distribution of the entire tire molding surface 10a of the upper mold 14 in the circumferential direction, and the temperature sensor 40d measures the temperature distribution of the entire tire molding surface 10a of the lower mold 15 in the circumferential direction.

  The control unit 60 controls the heating devices 32 and 35 and the elevating means 33 and 36 on the basis of a preset control program to add the unvulcanized tire T provided inside the tire molding die 10. The temperature sensor 40a, after the vulcanized tire is removed from the tire molding die 10 until the next unvulcanized tire T is set in the tire molding die 10 Based on the temperature distribution of the tire molding surface 10a detected at 40b, 40c, and 40d, the presence / absence of the stem 54 that has fallen from the housing 52 is detected.

  Next, the operation of the vulcanization molding apparatus 1 will be described based on FIG.

  First, in a state where the sector 12 and the upper mold 14 are spaced apart from the lower mold 15, the bead portion is fitted to the bead ring 17 and the unvulcanized tire T is mounted on the lower mold 15 of the tire molding die 10. After placing (setting), pressurized air is supplied to a bladder (not shown) and inflated to hold the tire T from the inside (step S1 in FIG. 4). In this state, the jacket ring 22 is located at the upper part of the segment 21, and the segment 21 is disposed outward in the tire radial direction.

  In the vulcanization molding apparatus 1, in order to shorten the vulcanization time of the tire T, not only during the vulcanization molding of the tire T in the tire molding die 10, but also the tire T is set in the tire molding die 10. The tire molding die 10 and the segment 21 are always heated to a predetermined temperature by the heating devices 32 and 35 while the tire molding die 10 described later is closed and opened.

  Then, the upper platen 31 is lowered by the elevating means 33 and the upper die 14 provided on the upper platen 31 is moved closer to the lower die 15 until the upper die 14 contacts the sidewall of the green tire T. The upper die 14 is moved to complete the closing of the upper die 14. While the upper die 14 is moving downward, the jacket ring 22 is lowered in synchronism with the upper die 14 by the elevating means 36 in a state where the segment 21 is disposed outward in the tire radial direction.

  Thus, in the state where the upper mold 14 is closed, not only the upper mold 14 but also the lower mold 15 is in contact with the sidewall portion of the green tire T, but the sector 12 connected to the segment 21 is green. The tire T is disposed at a position spaced from the tread portion of the tire T outward in the tire radial direction.

  Next, the lifting means 33 connected to the upper platen 31 is stopped, the lifting means 36 connected to the jacket ring 22 is operated, and the jacket ring 22 is lowered while sliding the inclined surface 21 a of the segment 21. Thereby, the sector 12 together with the segment 21 moves inward in the tire radial direction and comes into contact with the tread portion of the tire T, and the closing of the tire molding die 10 is completed (step S2 in FIG. 4).

  Next, when the mold closing of the tire molding die 10 is completed, this state is maintained for a predetermined time, and the tire T is pressure-deformed between the bladder (not shown) and the tire molding die 10 and the heating device 32, It is vulcanized by heat from 35 (step S3 in FIG. 4).

  Next, when the vulcanization molding of the tire T is completed, the elevating means 36 is operated while the elevating means 33 is stopped, and the jacket ring 22 is raised while sliding the inclined surface 21 a of the segment 21. 3 is moved outward in the tire radial direction, the lifting means 33 and the lifting means 36 are operated, and the upper die 14 and the sector 12 are moved away from the lower die 15 so that the die is opened as shown in FIG. (Step S4 in FIG. 4), the vulcanized tire T is taken out from the lower mold 15 (Step S5 in FIG. 4).

  Then, after taking out the vulcanized tire T, before setting the unvulcanized tire T to be vulcanized next on the lower mold 15, the upper mold 14 and the sector 12 disposed above and below A rotating body 42 provided with temperature sensors 40a, 40b, 40c, and 40d is disposed between the lower mold 15 and the disposed lower mold 15 (step S6 in FIG. 4), and the temperature sensors 40a, 40b, 40c and 40d measure the temperature distribution of the tire molding surface 10a of the tire molding die 10 (step S7 in FIG. 4).

  Data relating to the temperature distribution of the tire molding surface 10a of the tire molding die 10 measured by the temperature sensors 40a, 40b, 40c, and 40d is input to the control unit 60. Based on the data regarding the temperature distribution of the tire molding surface 10a input from the temperature sensors 40a, 40b, 40c, and 40d, the control unit 60 includes the stem 54 from the housing 52 in the exhaust plug 50 attached to the vent hole 18. It is determined whether or not there is an exhaust plug 50 that has been dropped (step S8 in FIG. 4).

  In the vulcanization molding apparatus 1, the sector 12, the upper mold 14, and the lower mold 15 are heated by the heating devices 32 and 35 even in the mold open state in which the upper mold 14 and the sector 12 are moved away from the lower mold 15. Therefore, the tire molding surface 10a is heated to a predetermined temperature, and the housing 52 and the stem 54 constituting the exhaust plug 50 attached to the vent hole 18 are also heated to a temperature substantially equal to the tire molding surface 10a. On the other hand, when the stem 54 is removed from the housing 52, the hollow portion 52a of the cylindrical housing 52 is exposed to the tire molding surface 10a of the tire molding die 10, and therefore the exhaust plug 50 from which the stem 54 has dropped is attached to the tire molding surface. The surface temperature is lower than that of the exhaust plug 50 to which the 10a and the stem 54 are attached. Therefore, in the temperature distribution of the tire molding surface 10a measured by the temperature sensors 40a, 40b, 40c, and 40d in a state in which the tire molding die 10 is heated, a low temperature lower than a predetermined temperature (for example, 0.5 ° C.) by more than a predetermined temperature. If there is an area, the control unit 60 determines that the low temperature area is a dropout portion of the stem 54 and detects the dropout of the stem 54.

  Then, if there is no exhaust plug 50 in which the stem 54 has been removed from the housing 52, the control unit 60 returns to step S1 and moves the unvulcanized tire T to be vulcanized next to the bottom of the tire molding die 10. The next unvulcanized tire T is set in the mold 15 and vulcanized.

  On the other hand, when the exhaust plug 50 from which the stem 54 has dropped is present, the heating of the tire molding die 10 by the heating devices 32 and 35 is stopped, the vulcanization molding device 1 is stopped, and the stem 54 has been dropped. Is notified.

  In the vulcanization molding apparatus 1 according to the present embodiment, whether or not the stem 54 is dropped after the vulcanized tire T is removed from the tire molding die 10 until the next unvulcanized tire T is vulcanized. Therefore, the unvulcanized tire T is not vulcanized and molded with the stem 54 dropped off, and many tires with unintentional spews can be obtained, or tires with mixed valve members can be obtained. It is possible to prevent the vulcanization molding from flowing into the subsequent process.

  In addition, in the present embodiment, the heating devices 32 and 35 detect the dropping of the stem 54 in a state where the tire molding die 10 is heated without cooling the tire molding die 10 in order to detect the dropping of the stem 54. Therefore, when a large number of tires T are continuously vulcanized and molded, the vulcanization molding time of the tires T can be suppressed from becoming longer.

(Second Embodiment)
Hereinafter, a second embodiment of the present invention will be described with reference to FIG.

  In the present embodiment, the temperature distribution of the tire molding surface 10a measured by the temperature sensors 40a, 40b, 40c, and 40d is compared with the reference temperature distribution data stored in advance in the storage unit 62 provided in the control unit 60. Thus, the point that the stem 54 of the exhaust plug 50 attached to the vent hole 18 is detected is different from the first embodiment.

  Specifically, the heating conditions for vulcanizing and molding the tire T are the same as those in which all the stems 54 of the exhaust plug 50 are mounted in all the vent holes 18 provided in the tire molding die 10 without dropping off. The control unit 60 stores the temperature distribution of the tire molding surface 10a when the tire molding die 10 is heated by the heating devices 32 and 35 under the conditions as reference temperature distribution data in the storage unit.

  Then, after taking out the vulcanized tire T from the tire molding die 10 and before setting the unvulcanized tire T to be vulcanized next on the lower mold 15, the upper mold 14 disposed above is disposed. In addition, a rotating body 42 provided with temperature sensors 40a, 40b, 40c, 40d is disposed between the sector 12 and the lower mold 15 disposed below, and the temperature sensors 40a, 40b, 40c are rotated while the rotating body 42 is rotated. , 40d measure the temperature distribution of the tire molding surface 10a of the tire molding die 10.

  The control unit 60 receives data related to the temperature distribution of the tire molding surface 10a of the tire molding die 10 measured by the temperature sensors 40a, 40b, 40c, and 40d, and stores the data in the storage unit 62 as reference temperature distribution data. In the temperature distribution of the tire molding surface 10a measured by the temperature sensors 40a, 40b, 40c, and 40d, if there is a low temperature region that is lower than the reference temperature distribution data by a predetermined temperature (for example, 0.5 ° C.) or more, The low temperature region is determined to be the dropping position of the stem 54, and the dropping of the stem 54 is detected.

  In addition, the control part 60 is the temperature of the tire molding surface 10a measured by the temperature sensors 40a, 40b, 40c, and 40d after the vulcanization molding apparatus 1 is started and before the unvulcanized tire T is set on the lower mold 15. When the distribution is used as reference temperature distribution data or when vulcanization molding of a large number of unvulcanized tires is performed continuously, the temperature distribution of the tire molding surface 10a measured after the previous vulcanization molding is stored as reference temperature distribution data. 62 can be stored.

  In this embodiment, the tire molding die 10 in which all the temperature distributions of the tire molding surface 10a measured by the temperature sensors 40a, 40b, 40c, and 40d are mounted without dropping off the stem 54 is heated. In order to detect the drop of the stem 54 in comparison with the reference temperature distribution data that is the temperature distribution of the tire molding surface 10a when heated at 32, 35, for example, the stem 54 even when there is a temperature difference on the tire molding surface 10a. Can be accurately detected.

  Although some embodiments have been described above, these embodiments are presented as examples and are not intended to limit the scope of the invention. These novel embodiments can be implemented in various other forms, and various omissions, replacements, and changes can be made without departing from the scope of the invention.

DESCRIPTION OF SYMBOLS 1 ... Vulcanization molding apparatus 10 ... Tire molding die 10a ... Tire molding surface 18 ... Vent hole 30 ... Vulcanizer 32 ... Heating device 33 ... Lifting means 35 ... Heating device 36 ... Lifting means 40a ... Temperature sensor 40b ... Temperature sensor 40c ... temperature sensor 40d ... temperature sensor 42 ... rotor 50 ... exhaust plug 52 ... housing 52a ... hollow part 54 ... stem 56 ... spring 60 ... control part

Claims (2)

Vulcanization molding comprising a tire molding die having a vent hole formed in a tire molding surface, a valve member attached to the vent hole for opening and closing the vent hole, and a heating device for heating the tire molding die. In the device
A non-contact temperature sensor for measuring a temperature distribution of the tire molding surface of the heated tire molding die;
A vulcanization molding apparatus comprising: a detection unit that detects a dropout of the valve member attached to the vent hole from a temperature distribution acquired by the temperature sensor. Vulcanization molding comprising a tire molding die having a vent hole formed in a tire molding surface, a valve member attached to the vent hole for opening and closing the vent hole, and a heating device for heating the tire molding die. In the device
A non-contact temperature sensor for measuring a temperature distribution of the tire molding surface of the heated tire molding die;
A storage unit for storing data on the temperature distribution of the tire molding surface as a reference as reference temperature distribution data;
A vulcanization molding apparatus comprising: a detection unit that detects a dropout of the valve member attached to the vent hole by comparing a temperature distribution acquired by the temperature sensor with reference temperature distribution data stored in the storage unit.

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